Pirenoxine is a preparation of 1-hydroxy-5-oxo-5H-pyrido(3,2-α)-phenoxazine-3-carboxylic acid, a compound having a chemical structure similar to xanthommatin, an eye pigment of the insect, with a pyridophenoxazone nucleus.
The solvent is isotonic, buffered solution containing 0.02% methylparaben, 0.01% propylparaben and 0.0001% thimerosal as preservatives.